LOS ANGELES, Oct 31: A tropical mosquito known to carry potentially fatal diseases such as dengue and yellow fever has been detected in California, raising concerns among public health officials and prompting intense efforts to eradicate the insect. No illnesses associated with the mosquito, known by the scientific name Aedes aegypti, have been reported since it first appeared in California’s Central Valley in June, and none of the specimens trapped and tested has been found to be infected. (agencies)